578 ELIZABETH HOPKINS DUNN 
This increase apparently depended on the amount of obstruction 
offered by the connective tissue through which the nerve fibers 
must grow to reach their peripheral terminations. This inter- 
pretation may well account for the large number of fibers found 
in such sections as those shown in figures 3 and 4 and figures 5 
and 6. The growth of tissue around a gap in central nerve sub- 
Fig. 5 Showing massing of cortical fibers along the open wound (W). Fibers 
apparently extend into the internal capsule (J. C.). Freehand drawing from Sec- 
tion 121, Series I, Group IV, Rat 3. 
stance is comparable to their growth through connective tissue 
in peripheral nerves and may be governed by the same laws. 
THE GROWTH OF MEDULLATED NERVE FIBERS ACROSS 
CICATRICIAL TISSUE 
Ranson, ’03, demonstrated that processes of neurons could 
grow across cicatricial tissue and develop their medullary 
sheaths. These findings were on stab wounds of the corpus 
callosum in the albino rat. The cerebral cortex of operated 
